Conocephalum conicum, commonly known as the snake or snakeskin liverwort, is the largest of the thalloid liverworts. Its pale to dark green thallus can grow up to 20 cm long. The dorsal surface is covered with tiny hexagons, which makes the entire thallus seem snake-like. It has a wide distribution within moist, shady, cool forests across most of the northern hemisphere. Photo taken in Quinalt Rainforest, Olympic National Park, Washington.